Massive ribonucleoprotein bodies in gametophyte vegetative cells of the mossTimmiella barbuloides (Brid.) Moenk |
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Authors: | R. Ligrone |
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Affiliation: | (1) Dipartimento di Biologia Vegetale, Facoltà di Scienze, Universitá di Napoli, Italy;(2) Istituto di Botanica, via Foria 223, I-80139 Napoli, Italy |
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Abstract: | Summary Vegetative cells of the gametophyte phase of the mossTimmiella barbuloides (Pottiales) are characterized by large cytoplasmic bodies of spherical shape (SBs) whose ribonucleoprotein composition is cytochemically demonstrated. SBs seem to be derived from massive aggregation of cytoplasmic ribosomes, with possible participation by rough endoplasmic reticulum elements. SBs have been found in stereids, parenchymatous cells and young hydroids of the gametophyte stem, and in euricysts of the leaf nerve. The SBs develop early in the course of cell differentiation and, once formed, persist until advanced stages of cell senescence. |
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Keywords: | Biogenesis Cytochemistry Ribonucleoprotein bodies Ribosomes Timmiella barbuloides (Musci) Ultrastructure |
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